Berlin 2015 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Spins in organics

DS 32.6: Talk

Wednesday, March 18, 2015, 17:45–18:00, H 0111

Energy level alignment at the ordered C60/Co(0001) hybrid interface — •Johannes Stöckl, Martin Laux, Norman Haag, Johannes Seidel, Roman Fetzer, Nicolas Großmann, Benjamin Stadtmüller, Mirko Cinchetti, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schroedinger-Strasse 46, 67663 Kaiserslautern, Germany

The future success of organic semiconductors in spin memory devices depends strongly on our ability to tailor and control the structural properties and the energy level alignment at hybrid interfaces formed between the organic molecules and ferromagnetic surfaces. Hence, many studies focused on the electronic properties of prototype molecules like Alq3 on Co(100) [1]. On this ferromagnetic substrate, however, the molecular films usually lack any long range order due to the strong molecule substrate interaction and the low thermal energy of the adsorbates. To overcome this limitation, we studied the growth of (sub)monolayer films of C60 adsorbed on hcp Co(0001) using LEED, STM and spin resolved photoemission spectroscopy (SR-PES). For sub-monolayer coverage LEED and STM indicate that the C60 molecules form long-range ordered islands after thermal activation. The size of these islands increases with increasing coverage. The SR-PES data show a significant reduction of the spin polarization in comparison to the clean Co(0001) surface which we correlate to the suppression of a Co-surface state by the molecular adsorbates.

[1] Steil et al., Nature Physics 9, 242 (2013)